WowAce

Collectinator is an addon which will scan your pets and mounts and provide information on how to obtain them.

From bags we came, to bank we return

Tracks herbs/ore/items that can be broken into component pieces

Display Cooldown Count of Spell Icon and Item

Lightweight but powerful auction house interface

Item stat breakdown, analysis and comparison

EBB adds groups of bars to your screen showing you which (de)buffs currently affect your toon or some other units.

Assessment

Custom widgets for AceGUI-3.0 and AceConfigDialog-3.0.

Angry Assignments

Minimap addon of awesomeness. *chewing sound*. It'll nibble your hay pellets.

Bulk mail sending made really easy

Automatically turns on the combat log for selected raid and mythic+ instances.

Dynamic mount macro generator

Reports on a configurable dashboard or to group chat on consumables, buffs, AFK, mana and many many others but in an intellig...

Serenity skins for Masque.

Watches your chat, flagging missplled words, and offering correctly spelled suggestions.

XP bar using Ace3.

HideTalkingHead

Unit Frames of awesomeness. Woof. It'll bite your face off.